皮皮学，免费搜题
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【多选题】
下列哪些属于流行病学研究特征A.
群体特征
B.
以分布为起点
C.
比较的特征
D.
预防为主
E.
多病因论
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皮皮学刷刷变学霸
举一反三
【单选题】The cells of the body have varied and essential roles. Skin cells protect the whole body; red blood cells carry oxygen; and bone cells build the skeleton. Cells multiply fast when a person is growing,...
A.
needs a lot of food
B.
produces cancerous cells
C.
has need for preventive medicine
D.
has reached a maintenance level
【单选题】The human body is incredibly __________. When you donate a pint of blood, you lose about 3.5 trillion red blood cells, but your body quickly replaces them.
A.
supple
B.
flexible
C.
strong
D.
resilient
【单选题】When red blood cells of blood group A meet serum of blood group B, the red blood cells will ( )
A.
aggregation
B.
adhere
C.
overlap
D.
agglutinate
E.
clot
【单选题】Red blood cells are not easily broken when they flow through narrow capillaries and sinuses. The main reason is that
A.
The red blood cells are in the shape of a double concave disc
B.
higher viscosity in red blood cells
C.
Better elasticity of red blood cell membrane
D.
Slow blood flow here
【单选题】The cells of the body have varied and essential roles. Skin cells protect the whole body; red blood cells carry oxygen; and bone cells build the skeleton. Cells multiply fast when a person is growing,...
A.
during the growing years
B.
at all times
C.
during the period of childhood
D.
after reaching maturity
【简答题】Red blood cells are an exception since they have nonuclei___________.A. when mature B. when grown C. when produced D. when increased
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